Maximising throughput in multiwavelength optical networks operating in nonlinear regime

大容量、低时延的泛在宽带通信基础设施对数字经济的发展和壮大至关重要。光纤构成了这一基础设施的主干，必须确保有足够的容量来开发新的、高容量的生活转型服务。然而，光纤通道是非线性的。非线性信道的容量是未知的，研究的重点是开发合适的信道模型，以便能够计算不同调制格式和符号速率的可实现信息速率以及通过非线性缓解和编码可以实现的任何增加。虽然对于点对点链路，这些技术的可实现速率的增加可能是有限的，但当应用于网络拓扑时，它们可以转化为网络吞吐量的显著提高。这就需要将用于非线性信道的信息论和用于量化网络吞吐量的图论结合起来，作为网络拓扑和非线性信道属性的函数。这项研究可能会从整体上改变光网络体系结构和数据通信基础设施的设计。学生的研究重点是分析光纤系统和网络性能，当操作的带宽比目前使用的带宽要大得多时。光纤带宽工作范围的扩大要求对相干光纤传输的受激拉曼散射进行分析(迄今尚未分析)，开发用于系统和网络分析的快速分析工具，并在宽带非线性系统中量化网络吞吐量。与EPSRC主题领域相关：面向未来系统的智能信息基础设施和光子学具有战略优先事项的ICT；数字信号处理领域的数字经济，ICT网络。

High-capacity, low-delay ubiquitous broadband communication infrastructure is critical to the development and grown of the digital economy. Optical fibres form the backbone of this infrastructure and must ensure sufficient capacity for the development of new, high-capacity life transforming services. However, optical fibre channels are nonlinear. The capacity of nonlinear channels is unknown and the research is focused on the development of appropriate channel models to enable the calculation of achievable information rates for different modulation formats and symbol rates and any increaseswhich can be achieved through nonlinearity mitigation and coding. Whilst increases in achievable rates with these techniques may be limited for point-to-point links, they could be translated in significant gains in network throughput when applied to network topologies. This requires the combination of information theory for nonlinear channels and graph theory for quantifying network throughputs as a function of both the network topology and nonlinear channel properties. Potentially this research could transform he design of optical network architectures and the design of the data communications infrastructure as a whole. The student's research focuses on the ananlysis of optical fibre systems and network performance when operated over significantly wider bandwidths than used currently. Expansion of the optical fibre bandwidth operating range requires the analysis of stimulated Raman scattering for coherent optical fibre transmission, not analysed to date, the development of rapid analytical tools for systems and networks analysis and the quantification of the network throughputs in the wideband nonlinear regime.Relevance to EPSRC thematic areas: ICT with strategic priorities in Towards Intelligent Information Infrastructure and Photonics for future systems; Digital Economy in areas Digital Signal Processing, ICT Networks.